Steam boiler



g- 1929. H. c. HEATON STEAM BOILER Filed July 10, 1924 m ad/Q m W iPatented Aug. 27, 1929..

UNITED STATES v r 1,725,793 PATENT OFFICE.

HERMAN C. HEATON, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE BABCOCK & WILCOXCOMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

STEAM. BOILER.

Application filed Jul 10,

My invention particularly relates to steam boiler installations of thetype employing finely divided fuel, and will be best understood from thefollowing description taken with the annexed drawing which'shows more orless diagrammatically a verticalsection of an installation illustrativeof my invention.

In said drawing, 10 denotes a steam and water drum of a boiler of amodified cross drum type having banks of inclined water tubes 11 and 12,the ends of which are connected by the usual downtake headers 13, 13 anduptake headers 14, 14. For purposes which will be apparent, the tubebanks 11 and 12 are located a considerable distance below the drum 10and are connected thereto by means of uptake nipples 15, horizontaltubes 16 and downtake nipples 17, thereby defining a. chamber in whichthe combustion of pulverized coal orother finely divided fuel may takeplace. Steam returned to drum 10 is let off through pipe 18 (theconnection of which to the drum is not shown) and passes through asuperheater 19 located between the tube banks 11 and 12 and leaves theinstallation through pipe 20.

For the purpose of more or less completely surroundin the combustionchamber with heat absorbing surfaces, I provide at each side of thefurnace a vertical row of tubes 21, each of which rows is connected to apair of head-' ers 22, 23, uptake header 22 having a connection withdrum 10 through conduit 24 (shown in dotted lines and as extendingparallel to and outside of header 22), and nipples 25, and downtakeheader 23 being joined-to the drum through a downtake 26, conduit 27shown similarly to conduit 24 and nipples 28. Similar connections jointhe vertical bank oftubes constituting the opposite side wall, with drum10. In the installation shown, a pow dered fuel burner 29 is located inthe lower portion of the combustion chamber and is directed upwardly sothat the combustion gases are caused to make a 180 turn.

The gases of combustion after making a single pass over the tube banks11 and 12 are caused to pass over an economizer 30 directly beneath tubebank 12, and thence through an air heater 31. Below air heater 31 I haveprovided a washer 32 for abstracting the remaining portions of thesensible heat from the gases. A. suction fan 33 is used to aid thecirculation through the system. Any suitable liquid, such as water orrelatively concen- 1924. Serial No. 725,153.

trated sulphuric acid, may be used as the scrubbing medium in washer 32.Feed water is admitted through pipe 34, 2-way valve 35, economizer 30and pipe 36 connecting said economizer with the drum 10. I

It will be seen from the foregoing, that the combustion chamber issurrounded on the top by circulating tubes 16, on the front and rearends by downtake and uptake nipples 17 and 15, respectively, and oneither side by'a row of tubes 21, and is thus completely surrounded bywater tubes; In this manner the intense heat produced in the furnacechamber by the combustion of the finely divided fuel is ade quatelyutilized. In addition such an arrangement has the important advantagethat no masonry is exposed to the flame temperatures, thereby avoidingtroubles incident to the use of exposed refractories, which present aconsiderable problem inpowdered fuel furnaces.

Moreover, it has been proposed to cut down the size of and even to omitentirely the steam and water drums, in boilers for use with extremelyhigh pressures. In such boilers there is but little reserve capacitysteam and should the feed water supply be stopped immediately aftershutting off the burner, highly heated masonry if present would continueto produce steam in adjacent boiler heating surface, whereby suchheating surface might be severely damaged. By the use of my improvedarrangement however, this disadvantage is avoided and the feed watersupply may be stopped at the same time the burner is shut off.Furthermore, the feed water supply may be shut off at the same time thatthe fuel supply is stopped without running the risk of damaging thetubes. It will be apparent that the cutting down of the drum sizes ortheir elimination, is of particular importance in the use of high boilerpressures.

Locating the combustion chamber above the boiler tubes permits aconvenient arrangement of the subsequent heat absorbing units, such asthe feed water and air heaters and the washer, all of which may beplaced in vertical alignment, as shown.

Various changes will occur to those skilled in the art. 'For exam lo,the burner or burners 29 may be place near the top of the combustionchamber and the flames directed downwardly in a progressively wideningpath. It is to be understood that the above arrangement is illustrativeonly and that various changes may be made without departing from thespirit of my invention.

1 claim:

1. A boiler having a bank of inclined water tubes, uptake and downtakewater chambers connecting the ends of said tubes, an upper steam andwater drum above and spaced from said bank, a row of vertically disposedtubes connecting the tops of said downtake chambers with said drum, arow of horizontally disposed tubes connected to said drum, a row ofvertically disposed tubes connecting the tops of the uptake waterchambers with the ends of the tubes of said horizontal row, a row ofvertically disposed tubes at each side of said row of horizontallydisposed tubes and connections with saidvertically disposed tubes andsaid drum affording a circulation through said vertically disposedtubes, said bank and said rows of tubes forming a combustion chamber,and a finely-divided fuel supplying mechanism having an upwardlydirected nozzle projecting through one of said rows of verticallydisposed tubes and projecting the fuel upwardly at one side of saidchamber, the gas outlet for the chamber being positioned beneath saidbank.

2. A boiler having a bank of inclined water tubes, uptake and downtakewater chambers connecting the ends of said tubes, an upper steam andwater drum above and spaced from said bank, a row of vertically disposedtubes connecting the tops of said downtake chambers with said drum, arow of connections from the uptake water chambers to said drum,comprising tubes extending upwardly from said uptake water chambers, arow of vertically disposed tubes at each edge of said row of connectionsin planes at an angle to said row of connections, connections with saidvertically disposed tubes and said drum afiording circulation throughsaid verticall disosed tubes, said bank and said rows 0 tubes orming acombustion chamber, and a finelydivided fuel supplying mechanism havingan upwardly directed nozzle projecting through one of said rows ofvertically disposed tubes and projecting the fuel upwardly at one sideof said chamber, the gas "outlet for the said chamber being positionedbeneath said bank.

3. Aboiler having a bank of inclined water tubes, uptake and downtakewater chambers connecting the ends of said tubes, an upper steam andwater drum above and spaced from said bank, a row of vertcally disposedtubes connecting the tops of said downtake chambers with said drum, arow of horizontally disposed tubes connected to said drum, a row ofvertically disposed tubes connecting the tops of the uptake waterchambers with the ends of the tubes of said horizontal row, a row ofvertically disposed tubes at each side of said row of horizontallydisposed tubes and connections with said vertically disposed tubes andsaid drum affording a circulation through said vertically disposedtubes, said bank and said rows of tubes forming a combustion chamber,and a finely-divided fuel supplying mechanism for projectingfinelydivided fuel into said combustion chamber, the gas outlet fromsaid chamber being positioned beneath said bank.

4. A boiler having a bank of inclined water tubes, uptake and downtakewater chambers connecting the ends of said tubes, an upper steam andwater drum above and spaced from said bank, a row of vertically disposedtubes connecting the tops of said downtake chambers with said drum, arow of connections from the uptake water chambers to said drum,comprising tubes extending upwardly from said uptake chambers, a row oftubes ateach edge of said row of connections in planes at an angle tosaid row of connections, connections with said last named rows of tubesand said drum affording a circulation through said last named tubes,said bank and said rows of tubes forming a combustion chamber, and afinely-divided fuel supplying mechanism for projecting finely-dividedfuel into said combustion chamber, the gas outlet for said chamber beingpositioned beneath said bank.

HERMAN C. HEATON.

